Very high-frequency (50–715 GHz) electron paramagnetic resonance (EPR) studies of the tetranuclear Co complex [Co(hmp)(dmb)Cl]4 (1), where dmb is 3,3-dimethyl-1-butanol and hmp is the monoanion of 2-hydroxy-methylpyridine, reveal the presence of significant zero-field-splitting (ZFS) within the ground state spin multiplet. Meanwhile, low-temperature hysteresis measurements of 1 (and related Co ...
